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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcommonsequencetypes_p.h"
#include "qcommonvalues_p.h"
#include "qitemmappingiterator_p.h"
#include "qpatternistlocale_p.h"
#include "qtracefn_p.h"
QT_BEGIN_NAMESPACE
using namespace QPatternist;
namespace QPatternist
{
/**
* @short TraceCallback is a MappingCallback and takes care of
* the tracing of each individual item.
*
* Because Patternist must be thread safe, TraceFN creates a TraceCallback
* each time the function is evaluated. In other words, TraceFN, which is
* an Expression sub class, can't modify its members, but MappingCallback
* does not have this limitation since it's created on a per evaluation basis.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class TraceCallback : public QSharedData
{
public:
typedef QExplicitlySharedDataPointer<TraceCallback> Ptr;
inline TraceCallback(const QString &msg) : m_position(0),
m_msg(msg)
{
}
/**
* Performs the actual tracing.
*/
Item mapToItem(const Item &item,
const DynamicContext::Ptr &context)
{
QTextStream out(stderr);
++m_position;
if(m_position == 1)
{
if(item)
{
out << qPrintable(m_msg)
<< " : "
<< qPrintable(item.stringValue());
}
else
{
out << qPrintable(m_msg)
<< " : ("
<< qPrintable(formatType(context->namePool(), CommonSequenceTypes::Empty))
<< ")\n";
return Item();
}
}
else
{
out << qPrintable(item.stringValue())
<< '['
<< m_position
<< "]\n";
}
return item;
}
private:
xsInteger m_position;
const QString m_msg;
};
}
Item::Iterator::Ptr TraceFN::evaluateSequence(const DynamicContext::Ptr &context) const
{
const QString msg(m_operands.last()->evaluateSingleton(context).stringValue());
return makeItemMappingIterator<Item>(TraceCallback::Ptr(new TraceCallback(msg)),
m_operands.first()->evaluateSequence(context),
context);
}
Item TraceFN::evaluateSingleton(const DynamicContext::Ptr &context) const
{
const QString msg(m_operands.last()->evaluateSingleton(context).stringValue());
const Item item(m_operands.first()->evaluateSingleton(context));
return TraceCallback::Ptr(new TraceCallback(msg))->mapToItem(item, context);
}
SequenceType::Ptr TraceFN::staticType() const
{
return m_operands.first()->staticType();
}
QT_END_NAMESPACE
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